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Indebtedness - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 1,334,375  
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs $ 3,241 $ 3,554
Interest Rate [1] 3.59%  
Mortgage Loans Payable    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs $ 1,030 1,246
Extinguishment of debt, amount 72,073  
Net carrying value of industrial properties collateralized by mortgage loans 338,533  
Long-term Debt, Gross $ 223,804 297,610
2014 Unsecured Term Loan    
Debt Instrument [Line Items]    
Interest Rate [1] 3.39%  
Long-term Debt, Gross $ 200,000 200,000
2015 Unsecured Term Loan    
Debt Instrument [Line Items]    
Interest Rate [1] 2.89%  
Long-term Debt, Gross $ 260,000 260,000
2028 Private Placement Notes    
Debt Instrument [Line Items]    
Interest Rate 3.86%  
Long-term Debt, Gross $ 150,000 150,000
Effective Interest Rate 3.86%  
2030 Private Placement Notes    
Debt Instrument [Line Items]    
Interest Rate 3.96%  
Long-term Debt, Gross $ 150,000 $ 150,000
Effective Interest Rate 3.96%  
[1] The interest rate at March 31, 2019 also reflects the derivative instruments we entered into to effectively convert the variable rate to a fixed rate. See Note 10.